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Finding the Fourth Proportional to 8,391.70, 12,573.15 and 3,999.70

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Solution

The fourth proportional to 8,391.70, 12,573.15 and 3,999.70 is: 5,992.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.70 : 12,573.15 = 3,999.70 : x
  2. Step 2: Convert to fraction form
    8,391.70/12,573.15 = 3,999.70/x
  3. Step 3: Cross multiply
    8,391.70x = 12,573.15 × 3,999.70
  4. Step 4: Simplify right side
    8,391.70x = 50,288,828.06
  5. Step 5: Solve for x
    x = 50,288,828.06/8,391.70
  6. Step 6: Final answer
    x = 5,992.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.